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Commit 6ac2a4dd authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

[S390] improve mcount code 



Move the 64 bit mount code from mcount.S into mcount64.S and avoid
code duplication.

Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 04efc3be

arch/s390/kernel/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -41,7 +41,7 @@ obj-$(CONFIG_COMPAT) += compat_linux.o compat_signal.o \ 


obj-$(CONFIG_STACKTRACE)	+= stacktrace.o

obj-$(CONFIG_KPROBES)		+= kprobes.o

obj-$(CONFIG_FUNCTION_TRACER)	+= mcount.o

obj-$(CONFIG_FUNCTION_TRACER)	+= $(if $(CONFIG_64BIT),mcount64.o,mcount.o)

obj-$(CONFIG_DYNAMIC_FTRACE)	+= ftrace.o

obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o

arch/s390/kernel/mcount.S

+10 −137
Original line number Diff line number Diff line
@@ -11,111 +11,27 @@ 
ftrace_stub:

	br	%r14



#ifdef CONFIG_64BIT



#ifdef CONFIG_DYNAMIC_FTRACE



	.globl _mcount

_mcount:

	br	%r14



	.globl ftrace_caller

ftrace_caller:

	larl	%r1,function_trace_stop

	icm	%r1,0xf,0(%r1)

	bnzr	%r14

	stmg	%r2,%r5,32(%r15)

	stg	%r14,112(%r15)

	lgr	%r1,%r15

	aghi	%r15,-160

	stg	%r1,__SF_BACKCHAIN(%r15)

	lgr	%r2,%r14

	lg	%r3,168(%r15)

	larl	%r14,ftrace_dyn_func

	lg	%r14,0(%r14)

	basr	%r14,%r14

#ifdef CONFIG_FUNCTION_GRAPH_TRACER

	.globl	ftrace_graph_caller

ftrace_graph_caller:

	# This unconditional branch gets runtime patched. Change only if

	# you know what you are doing. See ftrace_enable_graph_caller().

	j	0f

	lg	%r2,272(%r15)

	lg	%r3,168(%r15)

	brasl	%r14,prepare_ftrace_return

	stg	%r2,168(%r15)

0:

#endif

	aghi	%r15,160

	lmg	%r2,%r5,32(%r15)

	lg	%r14,112(%r15)

#ifdef CONFIG_DYNAMIC_FTRACE

	br	%r14



	.data

	.globl	ftrace_dyn_func

ftrace_dyn_func:

	.quad	ftrace_stub

	.long	ftrace_stub

	.previous



#else /* CONFIG_DYNAMIC_FTRACE */



	.globl _mcount

_mcount:

	larl	%r1,function_trace_stop

	icm	%r1,0xf,0(%r1)

	bnzr	%r14

	stmg	%r2,%r5,32(%r15)

	stg	%r14,112(%r15)

	lgr	%r1,%r15

	aghi	%r15,-160

	stg	%r1,__SF_BACKCHAIN(%r15)

	lgr	%r2,%r14

	lg	%r3,168(%r15)

	larl	%r14,ftrace_trace_function

	lg	%r14,0(%r14)

	basr	%r14,%r14

#ifdef CONFIG_FUNCTION_GRAPH_TRACER

	lg	%r2,272(%r15)

	lg	%r3,168(%r15)

	brasl	%r14,prepare_ftrace_return

	stg	%r2,168(%r15)

#endif

	aghi	%r15,160

	lmg	%r2,%r5,32(%r15)

	lg	%r14,112(%r15)

	br	%r14



#endif /* CONFIG_DYNAMIC_FTRACE */



#ifdef CONFIG_FUNCTION_GRAPH_TRACER



	.globl	return_to_handler

return_to_handler:

	stmg	%r2,%r5,32(%r15)

	lgr	%r1,%r15

	aghi	%r15,-160

	stg	%r1,__SF_BACKCHAIN(%r15)

	brasl	%r14,ftrace_return_to_handler

	aghi	%r15,160

	lgr	%r14,%r2

	lmg	%r2,%r5,32(%r15)

	br	%r14



#endif /* CONFIG_FUNCTION_GRAPH_TRACER */



#else /* CONFIG_64BIT */



#ifdef CONFIG_DYNAMIC_FTRACE



	.globl _mcount

_mcount:

	br	%r14



	.globl ftrace_caller

ftrace_caller:

#endif

	stm	%r2,%r5,16(%r15)

	bras	%r1,2f

#ifdef CONFIG_DYNAMIC_FTRACE

0:	.long	ftrace_dyn_func

#else

0:	.long	ftrace_trace_function

#endif

1:	.long	function_trace_stop

2:	l	%r2,1b-0b(%r1)

	icm	%r2,0xf,0(%r2)
@@ -131,53 +47,13 @@ ftrace_caller: 
	l	%r14,0(%r14)

	basr	%r14,%r14

#ifdef CONFIG_FUNCTION_GRAPH_TRACER

#ifdef CONFIG_DYNAMIC_FTRACE

	.globl	ftrace_graph_caller

ftrace_graph_caller:

	# This unconditional branch gets runtime patched. Change only if

	# you know what you are doing. See ftrace_enable_graph_caller().

	j	1f

	bras	%r1,0f

	.long	prepare_ftrace_return

0:	l	%r2,152(%r15)

	l	%r4,0(%r1)

	l	%r3,100(%r15)

	basr	%r14,%r4

	st	%r2,100(%r15)

1:

#endif

	ahi	%r15,96

	l	%r14,56(%r15)

3:	lm	%r2,%r5,16(%r15)

	br	%r14



	.data

	.globl	ftrace_dyn_func

ftrace_dyn_func:

	.long	ftrace_stub

	.previous



#else /* CONFIG_DYNAMIC_FTRACE */



	.globl _mcount

_mcount:

	stm	%r2,%r5,16(%r15)

	bras	%r1,2f

0:	.long	ftrace_trace_function

1:	.long	function_trace_stop

2:	l	%r2,1b-0b(%r1)

	icm	%r2,0xf,0(%r2)

	jnz	3f

	st	%r14,56(%r15)

	lr	%r0,%r15

	ahi	%r15,-96

	l	%r3,100(%r15)

	la	%r2,0(%r14)

	st	%r0,__SF_BACKCHAIN(%r15)

	la	%r3,0(%r3)

	l	%r14,0b-0b(%r1)

	l	%r14,0(%r14)

	basr	%r14,%r14

#ifdef CONFIG_FUNCTION_GRAPH_TRACER

	bras	%r1,0f

	.long	prepare_ftrace_return

0:	l	%r2,152(%r15)
@@ -185,14 +61,13 @@ _mcount: 
	l	%r3,100(%r15)

	basr	%r14,%r4

	st	%r2,100(%r15)

1:

#endif

	ahi	%r15,96

	l	%r14,56(%r15)

3:	lm	%r2,%r5,16(%r15)

	br	%r14



#endif /* CONFIG_DYNAMIC_FTRACE */



#ifdef CONFIG_FUNCTION_GRAPH_TRACER



	.globl	return_to_handler
@@ -211,6 +86,4 @@ return_to_handler: 
	lm	%r2,%r5,16(%r15)

	br	%r14



#endif /* CONFIG_FUNCTION_GRAPH_TRACER */



#endif /* CONFIG_64BIT */
 
#endif

arch/s390/kernel/mcount64.S

0 → 100644
+78 −0
Original line number Diff line number Diff line 
/*

 * Copyright IBM Corp. 2008,2009

 *

 *   Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,

 *

 */



#include <asm/asm-offsets.h>



	.globl ftrace_stub

ftrace_stub:

	br	%r14



	.globl _mcount

_mcount:

#ifdef CONFIG_DYNAMIC_FTRACE

	br	%r14



	.data

	.globl	ftrace_dyn_func

ftrace_dyn_func:

	.quad	ftrace_stub

	.previous



	.globl ftrace_caller

ftrace_caller:

#endif

	larl	%r1,function_trace_stop

	icm	%r1,0xf,0(%r1)

	bnzr	%r14

	stmg	%r2,%r5,32(%r15)

	stg	%r14,112(%r15)

	lgr	%r1,%r15

	aghi	%r15,-160

	stg	%r1,__SF_BACKCHAIN(%r15)

	lgr	%r2,%r14

	lg	%r3,168(%r15)

#ifdef CONFIG_DYNAMIC_FTRACE

	larl	%r14,ftrace_dyn_func

#else

	larl	%r14,ftrace_trace_function

#endif

	lg	%r14,0(%r14)

	basr	%r14,%r14

#ifdef CONFIG_FUNCTION_GRAPH_TRACER

#ifdef CONFIG_DYNAMIC_FTRACE

	.globl	ftrace_graph_caller

ftrace_graph_caller:

	# This unconditional branch gets runtime patched. Change only if

	# you know what you are doing. See ftrace_enable_graph_caller().

	j	0f

#endif

	lg	%r2,272(%r15)

	lg	%r3,168(%r15)

	brasl	%r14,prepare_ftrace_return

	stg	%r2,168(%r15)

0:

#endif

	aghi	%r15,160

	lmg	%r2,%r5,32(%r15)

	lg	%r14,112(%r15)

	br	%r14



#ifdef CONFIG_FUNCTION_GRAPH_TRACER



	.globl	return_to_handler

return_to_handler:

	stmg	%r2,%r5,32(%r15)

	lgr	%r1,%r15

	aghi	%r15,-160

	stg	%r1,__SF_BACKCHAIN(%r15)

	brasl	%r14,ftrace_return_to_handler

	aghi	%r15,160

	lgr	%r14,%r2

	lmg	%r2,%r5,32(%r15)

	br	%r14



#endif